Dayton, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.8 °F (low) to 54.5 °F (high). Annual precipitation averages 32.3 Inches. Dayton is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.3 °F | 22.7 °F | 0.8 in. |
| February | 8.8 °F | 27.6 °F | 0.84 in. |
| March | 20.8 °F | 40.4 °F | 1.56 in. |
| April | 33.3 °F | 55.3 °F | 2.89 in. |
| May | 46.3 °F | 68.5 °F | 4.3 in. |
| June | 56.6 °F | 77.9 °F | 4.53 in. |
| July | 61.7 °F | 82.7 °F | 4.32 in. |
| August | 58.9 °F | 80.1 °F | 4.08 in. |
| September | 50.6 °F | 72.3 °F | 3.53 in. |
| October | 37.4 °F | 57.3 °F | 2.7 in. |
| November | 25.1 °F | 41.8 °F | 1.61 in. |
| December | 12.5 °F | 27.9 °F | 1.14 in. |
| Annual | 34.8 °F | 54.5 °F | 32.3 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |